Ali Soufan is a former FBI agent who's spent a decade speaking out against torture. He helped expose CIA "enhanced interrogation techniques," and left the Bureau partly because of the agency's excessive use of it.

Illegal searches in violation of the Fourth Amendment could be justified by gaining evidence of crimes and prosecuting and convicting those who are guilty. Listening in on the content of all conversations could aid in learning of past and future acts of terrorism. The list is endless.